HY5PS56421LF-E3 Datasheet, PDF(31/35 Page) Hynix Semiconductor

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HY5PS56421LF-E3 Datasheet, PDF (31/35 Pages) Hynix Semiconductor – 256Mb DDR2 SDRAM

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HY5PS56421(L)F

HY5PS56821(L)F

HY5PS561621(L)F

9. tIS and tIH (input setup and hold) derating

tIS, tIH Derating Values

CK, CK Differential Slew Rate

2.0 V/ns

1.5 V/ns

1.0 V/ns

4.0

3.5

3.0

2.5

2.0

1.5

1.0

Command / 0.9

Address 0.8

Slew 0.7

rate(V/ns) 0.6

0.5

0.4

0.3

0.25

0.2

0.15

0.1

â³tIS

+187

+179

+167

+150

+125

+83

-11

-25

-43

-67

-100

-150

-223

-250

-500

-750

-1250

â³tIH

+94

+89

+83

+75

+45

+21

-14

-31

-54

-83

-125

-188

-292

-375

-500

-708

-1125

â³tIS

TBD

â³tIH

TBD

â³tIS

TBD

â³tIH

TBD

Un i ts

Note s

1) For all input signals the total tIS(setup time) and tIH(hold) time) required is calculated by adding the

datasheet value to the derating value listed in above Table.

Setup(tIS) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of

VREF(dc) and the first crossing of VIH(ac)min. Setup(tIS) nominal slew rate for a falling signal is defined as the

slew rate between the last crossing of VREF(dc) and the first crossing of VIL(ac)max. If the actual signal is

always earlier than the nominal slew rate for line between shaded âVREF(dc) to ac regionâ, use nominal slew

rate for derating value(see fig a.) If the actual signal is later than the nominal slew rate line anywhere between

shaded âVREF(dc) to ac regionâ, the slew rate of a tangent line to the actual signal from the ac level to dc level

is used for derating value(see Fig b.)

Hold(tIH) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of

VIL(dc)max and the first crossing of VREF(dc). Hold(tIH) nominal slew rate for a falling signal is defined as the

slew rate between the last crossing of VREF(dc). If the actual signal signal is always later than the nominal

slew rate line between shaded âdc to VREF(dc) regionâ, use nominal slew rate for derating value(see Fig.c) If

the actual signal is earlier than the nominal slew rate line anywhere between shaded âdc to VREF(dc) regionâ,

the slew rate of a tangent line to the actual signal from the dc level to VREF(dc) level is used for derating

value(see Fig d.)

Rev 1.0 / July. 2004

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